Telephone diaphragm



' I 1,640,915 g- ,9; c. G. WIELAND TELEPHONE DIAPHRAGM Filed June 22. 1925 INVENTOR v (Year/es Maw ATTORNEY a thin sheet or disk of iron W11 I oh the strength "PATENT OFFICE.

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awnmmn meanne 22, 19. Serial m. 88,681.

This invention relates to diaphragms such v as are used in telephonereceivers. The

present invention being a further development of my invention for which I have filed "5 an application for Letters Patent on April 4', 1924,. Serial 170,704,131.

As is known, he reproduction ofi the voice, or of soun s generally, in the telephone receiver -is due to the -v'bration of is placed adjacent the two ends of the usual horseshoe magnet, the disk being secured at its ed es only so that it may be free to vibrate. he strength oi the sound produced depends of the magnetic field around the poles of the magnet, the stronger the etic field the stronger the sound, and 1t resent invention to ma ist e purpose ofthe rovidea-construction'w ich presentsama netic field'of increased strength, and Wh1C will better utilize the strength of the magnet. To strengthen themagnetic field it s necessary to'put a larger mass'oi ma etic material such as iron op osite the-p0 es of the magnet, and to do this I make use of a 2 diaphragm of material at its center in form of a boss or bosses alongthe two ends of the usual horseshoe magnet, to produce a magnetic field of increased -strength while at the same time preserving the essential fiexihility of the diaphra on the outer or marginal portiontherep.

Another object of the inventionis the provision of novel and im gpved securing. means for attaching the dia agm to the receiver "cup and'shell in Q or to positively avoid any accidental displacement of the same.

the provision of a iaphragm having a recess formed on one part ,of create lips adapted to engagp the shell of the receiver and having a nail 0le at a dlametrically opposite art for allowin Ibe driventhr'oug the same intot e receiver cup for positivel securing said diaphragm against accidenta vdls lacement.

' For further compre ension of the invention, and of the objects and. advantages thereof, reference will be had the follow} description and ,accompanym drawing, and to the appended cla1ms in which the various features of theiinvention are more particularly set forth.

material part of this losure: v. e

1 its center part, either a.

presenting an increased amount. p ed of the telephone'receivercup, while at itsmargm to.

a nail to .has two bosses 17 and 18 form vma be In the accompanyin drawing forming a.

I F1 1 1s a face view of a d aphra for telep one receivers constructed accor ihgto my invention.

Fig. 2 is a section on line 22 ofFigure Fig. 3 is a view similar to Figure 1, of a modified form of my invention.

'F1g. 4 is a section on line 4.-4 of Figure 3..

, Fig. 5-is a section on line 5-5 of Figure 3. I In the form of the invention illustrated in Figures 1 and 2, the diaphragm consists of a metal disc 10 havin in approximately ss 11 made integrall therewith on its up er face, or also in a dition to boss 11 on its upper face, a boss 12.integral with'thedisc on the lower face thereof, both bosses being substantially located above the'poles of the customary horse-shoe magnet of the telephone receiver. -The diaphragm is free to vibrate as the; disc surroundingthe centrally located boss or bosses is flat and thin, and because the diaphragm is supported and held in positionnear its petisuphery on two oppositely dispoin At one of these points it is provided with a hole 13 allowingthe assage of a nail or the. like, adapted to be driven into the, edge te point diametrically opposite to the nail hole, the diaphragm is provided with a recess 14 by cutt n the material in the middle and bending t e cut pieces down to form paralthe diaphragm and these ips depen and fit into the edge of the receiver shell so that the diaphragm will be held securely-in its ad- A still ,further ob'ect of the mvention s justed' position and cannot be moved while the cover forthe receiver shell is screwed 1 into place.

Inthe modified form of my diaphragm for the telephone receivers, illustrated in. Figures 3, i, and 5', the diaphra m disc 16 therewith on the side facing-*the ends; of the poles of the horse-shoe magnet, each boss oppositely disposed to one of said oles, or the disc. 16 provided, as in 'cated in Figure 5, 106 on oth sides with se' a'rate bosses 17 and 18 r on its up or face an 19, and 20 on its lower face, eac twooi saidbosses '18 and 19, and 17 and 20 located above the ends of the poles of the horse-shoe magnet respectively.

It should be understood that the openings 13 and 14in the edge of the disc are diamet I rically o posite from each other and that by means 0 these openings the diaphragm is secured in place. As a result of securing the diaphra at diametricall spaced points the fre 0m of vibration 0 that portion 0 the diaphra m on each sideof the diameter connectlng 1: ese oints is somewhat reduced. When an undivi ed boss is mounted on the disc at the portion thereof that is adjacent the common diameter which includes the fixed points, the vibratil-e pro erties of the disc are further im aired for t e boss which is attached to the ess vibratile area of the articularly when the space hethe diaphragm has a recess formedtherewith by cutting t e material and bending the two parallel ips 15 formed by the cut downvslrlarl'illy to fit into the edge of the receiver s e It will be clear that the boss or bosses are thus kept in line and parallel with the poles of the horse-shoe magnet, so that any loss of magnetic force is very im ortant t at these bosses be in straight me and parallel with the horse-shoe magnet, otherwise there would be a loss of magnetic ower. To avoid this lossand keep this diaphragm firm, while screwing on the cover of the receiver shell, 0. little nail osses is in line with the common.

ositively avoided. It is.

driven in the edge ofthe cup rojecting thru the hole in the diaphragm, w ile on the otherside of the cup arecess in the edge of the cup is provided.

It will be clear and understood that while I have shown and described as an example the preferred embodimentsof my diaphragm,

such changes maybe made in the construction and arrangement of the bosses etc. as

fall within the scope of the appended claims,

without departure from the principle of my invention.

I claim as new and desire to secure by Letters Patent, is:

1 A diaphragm for telephone receivers comprisinga disc, having an aperture and a prO ection at diametrically o posite pointsadjacent the periphery thereo for adaptin said disc to be secured to a receiver, an

spaced apart bossesmade integral with said disc and extending in s aced relation to each other, and longitudina ly parallel to the diameter of said disc determined by said aperture and projection,

2. A diaphragm" comprisin a disc having an aperture adjacent the e ge thereof, for adapting said disc to be secured to a receiver, a downwardly directed projection on the edge of said disc diametrically op osite from said aperture for. adapting said disc to be secured to said receiver at a point diametrically opposite from said a erture, and bosses made integral with said isc and spaced apart from the central portion-thereof and from the diameter thereof determined by said projection and aperture. e

\ In testimony whereoflhave afiixed my 80 signature.

. CHARLES G. WIELAND.

Having thus described'my invention, what for telephone receivers 

